Carwash Emergency Stop

摘要: A carwash includes an emergency stop triggered by a car horn. controller with microphone listens to various sounds generated during the process and performs simple spectrum analyses identify characteristic of horns. Rather than knowing beforehand plethora different horns, recognizes any number unknown horns because virtually all horn tones are each comprised multiple prominent frequencies, as opposed single frequency note such electronic “beeeeep” microwave oven. Steady, readily distinguishable from noise spray, which might explain why humans can distinguish noises, regardless whether is louder or quieter surrounding sounds. In some examples, horn-activated automatically sends text/video message remote owner manager.